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Phased Array Radars

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Phased Array / SPY 1D. Phase Concept ... SPS-48 Air Search. AN/SPS 48. Synthetic ... Search. Track (so, TWS) Beam Steering. Time delay, Frequency, ... – PowerPoint PPT presentation

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Title: Phased Array Radars


1
Phased Array Radars
  • Naval Weapons Systems

2
Limitations of Mechanical Scanning Radars
  • Positioning Antenna is SLOW
  • Reduced reaction times
  • Blind Sided!
  • Mechanical error

3
Electronic Scanning
  • Increased Data Rates
  • Instantaneous Beam Positioning
  • Elimination of Mechanical Errors
  • Multi-mode Operation
  • Multi-target capability

4
Phased Array / SPY 1D
5
Phase Concept
  • Think about this
  • The electromagnetic energy received at a point in
    space from two or more closely spaced radiating
    elements is a maximum when the energy from each
    radiating element arrives at a point in phase.

6
Phase Relationships
  • Constructive Interference
  • Destructive Interference

7
Generating a Directional Main Lobe in a Phased
Array Radar
8
Beam Positioning
P
Point P where all waves arrive in phase
9
Methods of Beam Steering
  • 3 Kinds
  • Time Delay Scanning
  • Frequency Scanning
  • Phase Scanning

10
Methods of Beam Steering
  • Time Delay Scanning
  • Use of time delay to achieve the desired phase
    relationship
  • Time delay networks installed in front of each
    radiating element
  • Expensive, Complex Heavy

11
Time Delay Scanning
d
12
Methods of Beam Steering
  • Frequency Scanning
  • The physical length of the wave guide to delay
    the frequency interval
  • Vary the frequency about a base frequency
  • Very simple and relatively inexpensive.

13
Frequency Scanning
14
Methods of Beam Steering
  • Phase Scanning
  • Radiating elements fed by phase-shifting networks
    (Phasers)
  • Phasers are electronically adjustable
  • More expensive, than frequency scanning but
    cheaper than time delay
  • Most widely used SPY!

15
Phase Scanning
Phasers!!
16
Fleet Uses of Electronic Scanning
  • Ticonderoga
  • Arleigh Burke
  • SPS-48 Air Search

17
AN/SPS 48
18
Synthetic Aperture Array Radar
Uses the same theory of electronic scanning.
Motion of the target used as the antenna
aperture Sequential instead of
simultaneous High resolution imaging from
aircraft
19
ISAR
20
Electronic Scanning Summary
  • Electronic scanning is GROOVY!
  • Yeah Baby, Yeah!!!
  • Multiple functions
  • Search
  • Track (so, TWS)
  • Beam Steering
  • Time delay, Frequency, and Phase scanning
  • VERY BASIC LOOK AT ELECTRONIC SCANNING!

21
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